[#mp_units-epsilon]
= xref:mp_units.adoc[mp&lowbar;units]::epsilon
:relfileprefix: ../
:mrdocs:

Returns the epsilon of the quantity

== Synopsis

Declared in `&lt;mp&hyphen;units&sol;math&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    typename Rep,
    xref:mp_units/Reference.adoc[Reference] R&gt;
requires RepresentationOf&lt;Rep, get&lowbar;quantity&lowbar;spec(R&lcub;&rcub;)&gt; &amp;&amp; requires &lcub; std&colon;&colon;numeric&lowbar;limits&lt;Rep&gt;&colon;&colon;epsilon()&semi; &rcub;
&lsqb;&lsqb;deprecated, nodiscard&rsqb;&rsqb;
constexpr
xref:mp_units/quantity-01.adoc[quantity&lt;R&lcub;&rcub;, Rep&gt;]
epsilon(R r) noexcept;
----

== Description

The returned value is defined by a &period;

== Return Value

Quantity The epsilon value for quantity&apos;s representation type

== Template Parameters

[cols=2]
|===
| Name
| Description
| *Q*
| Quantity type being the base of the operation
|===


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